libgo/misc/cgo/test/issue3775.go

   1 // +build !android
   2
   3 package cgotest
   4
   5 /*
   6 void lockOSThreadCallback(void);
   7 inline static void lockOSThreadC(void)
   8 {
   9         lockOSThreadCallback();
  10 }
  11 int usleep(unsigned usec);
  12 */
  13 import "C"
  14
  15 import (
  16         "runtime"
  17         "testing"
  18 )
  19
  20 func init() {
  21         // Same as test3775 but run during init so that
  22         // there are two levels of internal runtime lock
  23         // (1 for init, 1 for cgo).
  24         // This would have been broken by CL 11663043.
  25         C.lockOSThreadC()
  26 }
  27
  28 func test3775(t *testing.T) {
  29         // Used to panic because of the UnlockOSThread below.
  30         C.lockOSThreadC()
  31 }
  32
  33 //export lockOSThreadCallback
  34 func lockOSThreadCallback() {
  35         runtime.LockOSThread()
  36         runtime.UnlockOSThread()
  37         go C.usleep(10000)
  38         runtime.Gosched()
  39 }